fix: guard rating calculation when ratingCount is zero (fixes #780)

[dolliecoder]

Description

Fixes #780

Guards the user rating calculation in explore_story_controller.dart to prevent invalid numeric results when ratingCount is zero or null.

Previously, the rating was calculated as:

userData['ratingTotal'] / userData['ratingCount'];

If ratingCount was 0 or null, this could produce NaN or Infinity, leading to incorrect values being displayed in the UI.

The calculation now safely returns 0.0 when ratingCount is not greater than zero.

Type of change
Bug fix (non-breaking change which fixes an issue)

How Has This Been Tested?

Manually tested with ratingCount = 0
Manually tested with ratingCount = null
Verified valid division when ratingCount > 0
Confirmed no NaN or Infinity values are produced

Checklist:

My code follows the style guidelines of this project
I have performed a self-review of my own code
I have made corresponding changes to the documentation
I have added tests that prove my fix is effective
My changes generate no new warnings

Summary by CodeRabbit

• Bug Fixes
  • Fixed a potential crash when calculating user ratings in the explore section by adding proper validation to prevent division by zero errors.

[github-actions]

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[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

Configuration used: defaults

Review profile: CHILL

Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between bf1dbe2 and 3f2d4da.

📒 Files selected for processing (1)

• lib/controllers/explore_story_controller.dart

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📝 Walkthrough

Walkthrough

The changes fix a division by zero bug in explore_story_controller.dart by introducing safe computation of userRating. Before dividing ratingTotal by ratingCount, the code now checks if ratingCount > 0, defaulting to 0.0 if the check fails. This prevents invalid calculations (NaN or Infinity) when rating count is zero.

Changes

Cohort / File(s)	Summary
Division by Zero Prevention lib/controllers/explore_story_controller.dart	Updated convertAppwriteDocListToUserList and convertMeilisearchResultsToUserList methods to safely compute userRating by checking if ratingCount > 0 before division; defaults to 0.0 otherwise, preventing NaN/Infinity results.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Poem

🐰 A rabbit hops through numbers, safe and sound,
No division by zero shall come around!
When ratings are zero, we don't divide,
Just return 0.0 with mathematical pride ✓

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and specifically describes the main bug fix: guarding the rating calculation against zero division, directly referencing issue #780.
Linked Issues check	✅ Passed	The code changes fully satisfy issue #780 requirements by safely computing userRating with zero guards and conditional division to prevent NaN/Infinity values.
Out of Scope Changes check	✅ Passed	All changes are directly scoped to fixing the rating calculation logic in convertAppwriteDocListToUserList and convertMeilisearchResultsToUserList, with no extraneous modifications.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing Touches

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• Post copyable unit tests in a comment

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[dolliecoder]

@M4dhav please review this pr